| 摘要 |
<p>The invention relates to an apparatus and a method for building a foundation for uprights, such as flagpoles, posts, pillars or the like, or for making passages e.g. for cables, tubes etc. The apparatus (1) includes a drive-shaft (3) equipped helical auger (2). Shaft (3) is provided with a tubular body portion (4, 4a). The end of body section (4a) facing said helical auger (2) is fitted with a conical section (5) tapering towards helical auger (2). Thus, when the apparatus is in operation, said tapered section (5) serves to compact a soil layer softened by helical auger (2).</p> |
